cregit-Linux how code gets into the kernel

Release 4.16 samples/timers/hpet_example.c

Directory: samples/timers
// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <memory.h>
#include <malloc.h>
#include <time.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <errno.h>
#include <sys/time.h>
#include <linux/hpet.h>


extern void hpet_open_close(int, const char **);
extern void hpet_info(int, const char **);
extern void hpet_poll(int, const char **);
extern void hpet_fasync(int, const char **);
extern void hpet_read(int, const char **);

#include <sys/poll.h>
#include <sys/ioctl.h>


struct hpet_command {
	
char		*command;
	
void		(*func)(int argc, const char ** argv);

} hpet_command[] = {
	{
		"open-close",
		hpet_open_close
	},
	{
		"info",
		hpet_info
	},
	{
		"poll",
		hpet_poll
	},
	{
		"fasync",
		hpet_fasync
	},
};


int main(int argc, const char ** argv) { unsigned int i; argc--; argv++; if (!argc) { fprintf(stderr, "-hpet: requires command\n"); return -1; } for (i = 0; i < (sizeof (hpet_command) / sizeof (hpet_command[0])); i++) if (!strcmp(argv[0], hpet_command[i].command)) { argc--; argv++; fprintf(stderr, "-hpet: executing %s\n", hpet_command[i].command); hpet_command[i].func(argc, argv); return 0; } fprintf(stderr, "do_hpet: command %s not implemented\n", argv[0]); return -1; }

Contributors

PersonTokensPropCommitsCommitProp
Randy Dunlap13899.28%150.00%
Mahesh Khanwalkar10.72%150.00%
Total139100.00%2100.00%


void hpet_open_close(int argc, const char **argv) { int fd; if (argc != 1) { fprintf(stderr, "hpet_open_close: device-name\n"); return; } fd = open(argv[0], O_RDONLY); if (fd < 0) fprintf(stderr, "hpet_open_close: open failed\n"); else close(fd); return; }

Contributors

PersonTokensPropCommitsCommitProp
Randy Dunlap65100.00%1100.00%
Total65100.00%1100.00%


void hpet_info(int argc, const char **argv) { struct hpet_info info; int fd; if (argc != 1) { fprintf(stderr, "hpet_info: device-name\n"); return; } fd = open(argv[0], O_RDONLY); if (fd < 0) { fprintf(stderr, "hpet_info: open of %s failed\n", argv[0]); return; } if (ioctl(fd, HPET_INFO, &info) < 0) { fprintf(stderr, "hpet_info: failed to get info\n"); goto out; } fprintf(stderr, "hpet_info: hi_irqfreq 0x%lx hi_flags 0x%lx ", info.hi_ireqfreq, info.hi_flags); fprintf(stderr, "hi_hpet %d hi_timer %d\n", info.hi_hpet, info.hi_timer); out: close(fd); return; }

Contributors

PersonTokensPropCommitsCommitProp
Jaswinder Singh Rajput12291.04%150.00%
Randy Dunlap128.96%150.00%
Total134100.00%2100.00%


void hpet_poll(int argc, const char **argv) { unsigned long freq; int iterations, i, fd; struct pollfd pfd; struct hpet_info info; struct timeval stv, etv; struct timezone tz; long usec; if (argc != 3) { fprintf(stderr, "hpet_poll: device-name freq iterations\n"); return; } freq = atoi(argv[1]); iterations = atoi(argv[2]); fd = open(argv[0], O_RDONLY); if (fd < 0) { fprintf(stderr, "hpet_poll: open of %s failed\n", argv[0]); return; } if (ioctl(fd, HPET_IRQFREQ, freq) < 0) { fprintf(stderr, "hpet_poll: HPET_IRQFREQ failed\n"); goto out; } if (ioctl(fd, HPET_INFO, &info) < 0) { fprintf(stderr, "hpet_poll: failed to get info\n"); goto out; } fprintf(stderr, "hpet_poll: info.hi_flags 0x%lx\n", info.hi_flags); if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) { fprintf(stderr, "hpet_poll: HPET_EPI failed\n"); goto out; } if (ioctl(fd, HPET_IE_ON, 0) < 0) { fprintf(stderr, "hpet_poll, HPET_IE_ON failed\n"); goto out; } pfd.fd = fd; pfd.events = POLLIN; for (i = 0; i < iterations; i++) { pfd.revents = 0; gettimeofday(&stv, &tz); if (poll(&pfd, 1, -1) < 0) fprintf(stderr, "hpet_poll: poll failed\n"); else { long data; gettimeofday(&etv, &tz); usec = stv.tv_sec * 1000000 + stv.tv_usec; usec = (etv.tv_sec * 1000000 + etv.tv_usec) - usec; fprintf(stderr, "hpet_poll: expired time = 0x%lx\n", usec); fprintf(stderr, "hpet_poll: revents = 0x%x\n", pfd.revents); if (read(fd, &data, sizeof(data)) != sizeof(data)) { fprintf(stderr, "hpet_poll: read failed\n"); } else fprintf(stderr, "hpet_poll: data 0x%lx\n", data); } } out: close(fd); return; }

Contributors

PersonTokensPropCommitsCommitProp
Randy Dunlap407100.00%1100.00%
Total407100.00%1100.00%

static int hpet_sigio_count;
static void hpet_sigio(int val) { fprintf(stderr, "hpet_sigio: called\n"); hpet_sigio_count++; }

Contributors

PersonTokensPropCommitsCommitProp
Randy Dunlap19100.00%1100.00%
Total19100.00%1100.00%


void hpet_fasync(int argc, const char **argv) { unsigned long freq; int iterations, i, fd, value; sig_t oldsig; struct hpet_info info; hpet_sigio_count = 0; fd = -1; if ((oldsig = signal(SIGIO, hpet_sigio)) == SIG_ERR) { fprintf(stderr, "hpet_fasync: failed to set signal handler\n"); return; } if (argc != 3) { fprintf(stderr, "hpet_fasync: device-name freq iterations\n"); goto out; } fd = open(argv[0], O_RDONLY); if (fd < 0) { fprintf(stderr, "hpet_fasync: failed to open %s\n", argv[0]); return; } if ((fcntl(fd, F_SETOWN, getpid()) == 1) || ((value = fcntl(fd, F_GETFL)) == 1) || (fcntl(fd, F_SETFL, value | O_ASYNC) == 1)) { fprintf(stderr, "hpet_fasync: fcntl failed\n"); goto out; } freq = atoi(argv[1]); iterations = atoi(argv[2]); if (ioctl(fd, HPET_IRQFREQ, freq) < 0) { fprintf(stderr, "hpet_fasync: HPET_IRQFREQ failed\n"); goto out; } if (ioctl(fd, HPET_INFO, &info) < 0) { fprintf(stderr, "hpet_fasync: failed to get info\n"); goto out; } fprintf(stderr, "hpet_fasync: info.hi_flags 0x%lx\n", info.hi_flags); if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) { fprintf(stderr, "hpet_fasync: HPET_EPI failed\n"); goto out; } if (ioctl(fd, HPET_IE_ON, 0) < 0) { fprintf(stderr, "hpet_fasync, HPET_IE_ON failed\n"); goto out; } for (i = 0; i < iterations; i++) { (void) pause(); fprintf(stderr, "hpet_fasync: count = %d\n", hpet_sigio_count); } out: signal(SIGIO, oldsig); if (fd >= 0) close(fd); return; }

Contributors

PersonTokensPropCommitsCommitProp
Randy Dunlap366100.00%1100.00%
Total366100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Randy Dunlap117590.45%125.00%
Jaswinder Singh Rajput1229.39%125.00%
Greg Kroah-Hartman10.08%125.00%
Mahesh Khanwalkar10.08%125.00%
Total1299100.00%4100.00%
Directory: samples/timers
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